Publications [#357724] of Michael E. Gehm

Papers Published

1. Liang, M; Ng, WR; Chang, K; Gbele, K; Gehm, ME; Xin, H, A 3-D luneburg lens antenna fabricated by polymer jetting rapid prototyping, IEEE Transactions on Antennas and Propagation, vol. 62 no. 4 (January, 2014), pp. 1799-1807 [doi]
   (last updated on 2024/12/31)

   Abstract:
   In this work, we designed, built, and tested a low-gain 20 dBi Luneburg Lens antenna using a rapid prototyping machine as a proof of concept demonstrator. The required continuously varying relative permittivity profile was implemented by changing the size of plastic blocks centered on the junctions of a plastic rod space frame. A 12-cm (4λ0 at at 10 GHz) diameter lens is designed to work at X-band. The effective permittivity of the unit cell is calculated by effective medium theory and simulated by full-wave finite-element simulations. The fabrication is implemented by a polymer jetting rapid prototyping method. In the measurement, the lens antenna is fed by an X-band waveguide. The measured gain of the antenna at X-band is from 17.3 to 20.3 dB. The measured half-power beam width is from 19° to 12.7° while the side lobes are about 25 dB below the main peak. Good agreement between simulation and experimental results is obtained. © 1963-2012 IEEE.